片段中的媒体控制器

Posted 2023-02-25

【中文标题】片段中的媒体控制器

【英文标题】：Media Controller in fragments

【发布时间】：2017-04-08 17:00:03

【问题描述】：

我正在尝试在 android Studio 中制作媒体控制器，但使用的是片段而不是活动，我正在使用下面的代码，但它给了我以下错误：

public class Tab1Helloworld extends Fragment 
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 
        View rootView = inflater.inflate(R.layout.tab1helloworld, container, false);
        return rootView;


        VideoView video = (VideoView)rootView.findViewById(R.id.videoView);

        video.requestFocus();

        String videopath = "android.resource://com.r.teamkape.kiddiecodiel/" + R.raw.helloworldvid;

        video.setVideoURI(Uri.parse(videopath));

        video.setMediaController(new MediaController(this)); //error in (this)[enter image description here][1]

        video.requestFocus();
        video.start();
    

【问题讨论】：

请添加日志以更好地帮助您，有什么问题？

错误：(33, 54) 错误：不兼容的类型：Tab1Helloworld 无法转换为上下文

使用 geActivity() 代替这个。

@fightingCoder Error:(25, 19) error: unreachable statement

return 语句应该在整个代码之后。

【参考方案1】：

public class Tab1Helloworld extends Fragment 
 
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
      View rootView = inflater.inflate(R.layout.tab1helloworld,container, false); 

     VideoView video = (VideoView)rootView.findViewById(R.id.videoView);

       video.requestFocus();

       String videopath = "android.resource://com.r.teamkape.kiddiecodiel/" + R.raw.helloworldvid;

       video.setVideoURI(Uri.parse(videopath));

       video.setMediaController(new MediaController(getActivity())); //error in (this)[enter image description here][1]

       video.requestFocus();
       video.start();
       return rootView;
          
   

【参考方案2】：

@xhen，使用下面的代码，效果很好，

在 xml 布局中添加这个

<sg.xyz.test.util.CustomVideoView
    android:id="@+id/videoview"
    android:layout_
    android:layout_
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentBottom="true"
    android:layout_alignParentTop="true"
     />

在您的 Fragment 类中调用这些方法

 private MediaController mediaController;
 private Uri uri;

 public void setupVideo()
 if (mediaController == null) 
                mediaController = new
                        MediaController(mContext);

                mediaController.setAnchorView(mBinding.videoview);
                mBinding.videoview.setMediaController(mediaController);
            
            try 
                uri = Util.buildURiPath(resourceID);
                mBinding.videoview.setVideoURI(uri);

             catch (Exception e) 
                Logger.debug("Error: " + e.getMessage());
                e.printStackTrace();
            
            mBinding.videoview.requestFocus();
            mBinding.imageView.setOnClickListener(new View.OnClickListener() 
                @Override
                public void onClick(View view) 

                    mBinding.videoview.start();

                    mBinding.imageView.setVisibility(View.INVISIBLE);

                
            );
            mBinding.videoview.setOnPreparedListener(new MediaPlayer.OnPreparedListener() 
                @Override
                public void onPrepared(MediaPlayer mp) 

                    mp.setOnVideoSizeChangedListener(new MediaPlayer.OnVideoSizeChangedListener() 
                        @Override
                        public void onVideoSizeChanged(MediaPlayer mediaPlayer, int width, int height) 
                            mediaController.setAnchorView(mBinding.videoview);
                        
                    );
                    Logger.debug("Duration = " +
                            mBinding.videoview.getDuration());

                
            );
            mBinding.videoview.setOnErrorListener(new MediaPlayer.OnErrorListener() 
                @Override
                public boolean onError(MediaPlayer mp, int what, int extra) 
                    AlertDialogFactory.buildAlertDialog(mContext, 0, R.string.video_playing_error).show();
                    return false;
                
            );
 


public static Uri buildURiPath(int resourceID)

    String uriPath = String.valueOf(Uri.parse("android.resource://" + LoginActivity.PACKAGE_NAME + "/"
            +resourceID));
    Uri uri = Uri.parse(uriPath);
    return uri;

用你的video 对象替换这个mBinding.videoview 就可以了。 现在，创建CustomVideoView 类

public class CustomVideoView extends VideoView 

private int width;
private int height;
private Context context;
private VideoSizeChangeListener listener;
private boolean isFullscreen;

public CustomVideoView(Context context) 
    super(context);
    init(context);


public CustomVideoView(Context context, AttributeSet attrs) 
    super(context, attrs);
    init(context);


/**
 * get video screen width and height for calculate size
 *
 * @param context Context
 */
private void init(Context context) 
    this.context = context;
    setScreenSize();


/**
 * calculate real screen size
 */
private void setScreenSize() 
    Display display = ((Activity) context).getWindowManager().getDefaultDisplay();

    if (Build.VERSION.SDK_INT >= 17) 
        //new pleasant way to get real metrics
        DisplayMetrics realMetrics = new DisplayMetrics();
        display.getRealMetrics(realMetrics);
        width = realMetrics.widthPixels;
        height = realMetrics.heightPixels;

     else if (Build.VERSION.SDK_INT >= 14) 
        //reflection for this weird in-between time
        try 
            Method mGetRawH = Display.class.getMethod("getRawHeight");
            Method mGetRawW = Display.class.getMethod("getRawWidth");
            width = (Integer) mGetRawW.invoke(display);
            height = (Integer) mGetRawH.invoke(display);
         catch (Exception e) 
            //this may not be 100% accurate, but it's all we've got
            width = display.getWidth();
            height = display.getHeight();
        

     else 
        //This should be close, as lower API devices should not have window navigation bars
        width = display.getWidth();
        height = display.getHeight();
    

    // when landscape w > h, swap it
    if (width > height) 
        int temp = width;
        width = height;
        height = temp;
    


/**
 * set video size change listener
 *
 */
public void setVideoSizeChangeListener(VideoSizeChangeListener listener) 
    this.listener = listener;


public interface VideoSizeChangeListener 
    /**
     * when landscape
     */
    void onFullScreen();

    /**
     * when portrait
     */
    void onNormalSize();


@Override
public void setVideoURI(Uri uri) 
    MediaMetadataRetriever retriever = new MediaMetadataRetriever();
    retriever.setDataSource(this.getContext(), uri);
    width = Integer.parseInt(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH));
    height = Integer.parseInt(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT));
    super.setVideoURI(uri);
    super.setVideoURI(uri);

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    if (context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) 
        // full screen when landscape
        setSize(height, width);
        if (listener != null) listener.onFullScreen();
        isFullscreen = true;
     else 
        // height = width * 9/16
        setSize(width, width * 9 / 16);
        if (listener != null) listener.onNormalSize();
        isFullscreen = false;
    


/**
 * @return true: fullscreen
 */
public boolean isFullscreen() 
    return isFullscreen;


/**
 * set video sie
 *
 * @param w Width
 * @param h Height
 */
private void setSize(int w, int h) 
    setMeasuredDimension(w, h);
    getHolder().setFixedSize(w, h);

【参考方案3】：

你添加的错误的问题

flag    Error:(33, 54) error: incompatible types: Tab1Helloworld cannot be converted to Context

在这一行

替换

video.setMediaController(new MediaController(this)); 

与

 video.setMediaController(new MediaController(getActivity())); 

也移动

return rootView; 

视频开始后到方法结束

【讨论】：

我在这一行出现错误 VideoView video = (VideoView)rootView.findViewById(R.id.videoView);

@fightingCoder Error:(26, 19) error: unreachable statement

@Hala.M 当我移动返回 rootView 时；不幸的是已停止

请添加日志

在日志中不显示错误，但单击按钮时应用程序本身崩溃